2. Suppose \( z^{3}+2 x^{2} y-y^{2} z=2 \) determines a function \( z=z(x, y) \) of \( x \) and \( y \) locally at \( (x, y, z)=(-1,1,-1) \) (a) Find the tangent plane approximation of \( z(x, y) \) at \( (x, y, z)=(-1,1,-1) \) (b) Find the quadratic surface approximation of \( z(x, y) \) at \( (x, y, z)=(-1,1,-1) \)

3. Determine the primary trigonometric ratios for each angle. \( \begin{array}{ll}\text { a) }-\frac{\pi}{2} & \text { c) } \frac{7 \pi}{4} \\ \text { b) }-\pi & \text { d) }-\frac{\pi}{6}\end{array} \)

HOW DOES THIS ACTIVITY SHOW THE LOSS OF CONTROL AN ADDICTED PERSON EXPERIENCES?

2. Calcular la media de los siguientes datos: \( 11,6,7,7,4 \). 3. Las edades de 8 niños que van a una fiesta son: \( 2,2,3,5,7,7,9,10 \). la edad media:

a. \( \quad f(x)=5 x \sqrt{25-x^{2}} \)

Simplify the expression \( (-1+6 i)+(-4+2 i) \) \( -5+8 i \) \( 3+8 i \) \( -3+8 i \) \( 5-8 i \)